ASME B16.9 covers factory-made butt weld fittings – elbows, tees, reducers, caps and returns – in sizes NPS 1/2″ through 48″. Below are the most-requested dimension tables for common sizes. Full tables down to every schedule are available on request.
90° and 45° Elbow Dimensions (Long Radius)
| NPS | OD (in) | 90° LR center-to-end A (in) | 45° center-to-end H (in) |
|---|---|---|---|
| 1/2 | 0.840 | 1.50 | 0.62 |
| 3/4 | 1.050 | 1.13 | 0.47 |
| 1 | 1.315 | 1.50 | 0.62 |
| 1 1/2 | 1.900 | 2.25 | 0.94 |
| 2 | 2.375 | 3.00 | 1.25 |
| 3 | 3.500 | 4.50 | 1.88 |
| 4 | 4.500 | 6.00 | 2.50 |
| 6 | 6.625 | 9.00 | 3.75 |
| 8 | 8.625 | 12.00 | 5.00 |
| 10 | 10.750 | 15.00 | 6.25 |
| 12 | 12.750 | 18.00 | 7.50 |
| 16 | 16.000 | 24.00 | 10.00 |
| 20 | 20.000 | 30.00 | 12.50 |
| 24 | 24.000 | 36.00 | 15.00 |
Tee & Reducer Key Dimensions
| NPS | OD (in) | Tee run C (in) | Tee outlet M (in) | Reducer F (in) |
|---|---|---|---|---|
| 2 | 2.375 | 2.50 | 1.69 | 3.00 |
| 4 | 4.500 | 4.50 | 3.38 | 5.00 |
| 6 | 6.625 | 6.50 | 4.62 | 7.00 |
| 8 | 8.625 | 8.50 | 5.88 | 9.00 |
| 12 | 12.750 | 12.50 | 8.38 | 13.00 |
| 24 | 24.000 | 24.00 | 15.00 | 25.00 |
Notes: dimensions apply to all wall thicknesses (schedule does not change center-to-end). 90° short radius A = 1.0 x NPS. 180° returns: center-to-center = 2 x A. Reducers listed at large-end size. Full tables incl. 4-way crosses, laterals, caps and inch/mm conversions: request the B16.9 dimension sheet.
FAQs
Does schedule change fitting dimensions? No – B16.9 center-to-end dimensions are constant per size; only wall thickness (and thus weight) changes with schedule.
Are B16.9 fittings the same as B16.28? B16.28 covers small-bore (1/2″-2″) wrought fittings with slightly different tolerances; B16.9 covers 1/2″-48″ and dominates process piping. See our B16.9 fittings guide.
More: Flange Types Guide · What Is a Flange? · Schedule Chart · NPS vs DN · All Articles
Cap & Return Dimensions
| NPS | OD (in) | Cap E (in) | 180° LR C-C (in) |
|---|---|---|---|
| 2 | 2.375 | 1.50 | 6.00 |
| 4 | 4.500 | 2.00 | 12.00 |
| 6 | 6.625 | 2.50 | 18.00 |
| 8 | 8.625 | 2.50 | 24.00 |
| 12 | 12.750 | 3.00 | 36.00 |
Cap E = overall height; 180° C-C = twice the 90° dimension. Tolerances per B16.9 Table 12. For DN (mm) versions of every table, request the full sheet.
Related fitting pages
Use the product pages below with the approved project specification when reviewing fitting dimensions and connection details.